The Internet of Things (IoT) is a rapidly growing field that connects billions of intelligent devices through wireless communication. It is considered a key part of the future internet, enabling devices to interact without human intervention. This survey reviews the definitions, architecture, technologies, and applications of IoT. It discusses various definitions of IoT, emerging technologies for its implementation, open issues in its applications, and major challenges that need to be addressed. The paper also explores current research on IoT system architecture, enabling technologies, and applications, as well as future research directions. The concept of IoT was first introduced by Kevin Ashton in 1999, referring to uniquely identifiable, interoperable connected objects using RFID technology. However, the exact definition of IoT is still evolving and depends on different perspectives. IoT is generally defined as a dynamic global network infrastructure with self-configuring capabilities based on standards and interoperable communication protocols. It includes both physical and virtual 'things' that have identities and attributes and can use intelligent interfaces to form an information network. The development of IoT involves many issues such as infrastructure, communication, interfaces, protocols, and standards. The paper discusses the current research on IoT, including its system architecture, enabling technologies, and applications. It also identifies emerging research issues and future research directions. The evolution of IoT can be illustrated by several phases, starting with RFID technology and extending to ambient intelligence and autonomous control. Various technologies, such as wireless sensor networks, barcodes, RFID, NFC, low energy wireless communications, and cloud computing, are involved in IoT. The success of IoT depends on standardization, which provides interoperability, compatibility, reliability, and effectiveness on a global scale. Objects in an IoT must be able to communicate and exchange data with each other autonomously. As IoT continues to evolve, it has the potential to be applied widely in numerous fields.The Internet of Things (IoT) is a rapidly growing field that connects billions of intelligent devices through wireless communication. It is considered a key part of the future internet, enabling devices to interact without human intervention. This survey reviews the definitions, architecture, technologies, and applications of IoT. It discusses various definitions of IoT, emerging technologies for its implementation, open issues in its applications, and major challenges that need to be addressed. The paper also explores current research on IoT system architecture, enabling technologies, and applications, as well as future research directions. The concept of IoT was first introduced by Kevin Ashton in 1999, referring to uniquely identifiable, interoperable connected objects using RFID technology. However, the exact definition of IoT is still evolving and depends on different perspectives. IoT is generally defined as a dynamic global network infrastructure with self-configuring capabilities based on standards and interoperable communication protocols. It includes both physical and virtual 'things' that have identities and attributes and can use intelligent interfaces to form an information network. The development of IoT involves many issues such as infrastructure, communication, interfaces, protocols, and standards. The paper discusses the current research on IoT, including its system architecture, enabling technologies, and applications. It also identifies emerging research issues and future research directions. The evolution of IoT can be illustrated by several phases, starting with RFID technology and extending to ambient intelligence and autonomous control. Various technologies, such as wireless sensor networks, barcodes, RFID, NFC, low energy wireless communications, and cloud computing, are involved in IoT. The success of IoT depends on standardization, which provides interoperability, compatibility, reliability, and effectiveness on a global scale. Objects in an IoT must be able to communicate and exchange data with each other autonomously. As IoT continues to evolve, it has the potential to be applied widely in numerous fields.